#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>

int main(int argc, char *argv[])
{
    if (argc != 3)
    {
        printf("usage:./tcpclient ip port\n");
        return -1;
    }

    int sockfd;
    struct sockaddr_in servaddr;
    char buf[1024];

    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        printf("socket() failed.\n");
        return -1;
    }

    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(atoi(argv[2]));
    servaddr.sin_addr.s_addr = inet_addr(argv[1]);

    if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) != 0)
    {
        printf("connect(%s:%s) failed.\n", argv[1], argv[2]);
        close(sockfd);
        return -1;
    }

    printf("connect ok.\n");

    for (int ii = 0; ii < 10000; ii++)
    {
        // 从命令行输入内容。
        memset(buf, 0, sizeof(buf));
        printf("please input:");
        scanf("%s", buf);
        // sprintf(buf,"1111111111111111111111ii=%08d",ii);

        if (write(sockfd, buf, strlen(buf)) <= 0)
        {
            printf("write() failed.\n");
            close(sockfd);
            return -1;
        }

        memset(buf, 0, sizeof(buf));
        if (read(sockfd, buf, sizeof(buf)) <= 0)
        {
            printf("read() failed.\n");
            close(sockfd);
            return -1;
        }

        printf("recv:%s\n", buf);

        // close(sockfd); break;
    }
}
